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Related Experiment Videos

A Bayesian Perspective on Accumulation in the Magnitude System.

Benoît Martin1, Martin Wiener2, Virginie van Wassenhove3

  • 1CEA, DRF/I2BM, NeuroSpin, INSERM, U992, Cognitive Neuroimaging Unit, Université Paris-Sud, Université Paris-Saclay, F-Gif/Yvette, France.

Scientific Reports
|April 6, 2017
PubMed
Summary

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Brain magnitude processing is not fully generalized. Duration perception is independent of size and number, but duration influences size and number perception, suggesting distinct sensory priors.

Area of Science:

  • Cognitive Neuroscience
  • Psychophysics
  • Computational Neuroscience

Background:

  • Theoretical and empirical work suggests a common brain system for processing magnitudes.
  • This implies cross-dimensional interference in subjective magnitude estimation.

Purpose of the Study:

  • To investigate if a generalized Bayesian magnitude system uses a common, amodal prior.
  • To test for cross-modal interference in magnitude perception.

Main Methods:

  • Two psychophysical experiments were conducted.
  • Participants estimated duration, surface area, and numerosity under manipulated non-target dimensions and evidence accumulation rates.

Main Results:

  • Duration estimation was unaffected by surface area or numerosity.

Related Experiment Videos

  • Changes in duration led to under- or over-estimations of surface area and numerosity.
  • Surface area and numerosity perception were sensitive to evidence accumulation rates, unlike duration.

    • Conclusions:

    • Results challenge the notion of a single, generalized Bayesian magnitude system.
    • A generalized system likely requires multiple, distinct priors for different magnitude dimensions.